Metrological assurance the technological production process and quality control of the grinding balls

The grinding balls bulk weight in fully unloaded mill

11 de abril de 2017

Technological process control of forged steel grinding balls production

3 de abril de 2017

Technological process control of forged steel grinding balls production carried out by the shift supervisor and testing laboratory assistant in accordance with the technological control scheme shown in Table. 1

Table 1. Technological control scheme on ball-rolling complex SHPK 25-120

Technological operation	Control location		Controlled parameter	Inspection method	Control periodicity	Responsible person for control
1	2		3	4	5	6
Billets acceptance: Conformity check information about incoming billet. Conformity check incoming billet to requirements of normative technical documentation and technological documentation	Billets warehouse		Melting number (batch number), Steel grade, Chemical composition, Batch weight	Visually	Constantly	Shift supervisor, Laboratory assistant
Loading billet into the furnace	Billets warehouse, Boot device Nominating Rolgang		Steel grade, dimensions, curvature, surface condition of the billet Billet displacement value	Visually Visually	Constantly Constantly	Loading desk operator
Melting stream	Nominating and furnace Rolgang		Different billet brands separation	Visually	Constantly	Loading desk operator
Billet heating Heating regime	Furnace		Furnace temperature Metal temperature before rolling	Control measuring instruments, VisuallyControl measuring instruments	Constantly Periodically Constantly	Operator, Laboratory assistant
Acceptance of rolling rolls	Billets warehouse Roll shop		Caliber dimensions in the calibration section	Template	After regrinding	Shift supervisor
Rolling mill setting Rolling rolls setting Rolling roll fittings setting	Rolling mill		Calibers surface condition Rolling rolls position Rolling roll fittings position Coaxiality	Visually Template Visually	During transshipment, As needed, During work process	Shift supervisor
The rolling Rolling control process	Rolling mill	Grinding balls diameter Grinding ball surface condition		Template Visually	Periodically	Roller operator, Shift supervisor
Grinding balls heat treatment Cooling regime Self-release	Hardening Drum aggregate Container or packaging tare	Drum rotation frequency Water temperature The water pressure at the inlet to the manufactory Duration of self-release		Control measuring instruments Hours	In establishing the new regime Periodically during work process Constantly	Shift supervisor, Laboratory assistant Shift supervisor Shift supervisor
Technological control of heat-strengthening grinding balls		Grinding balls surface		Hardness tester	In accordance with paragraph 3.3.3.1	Shift supervisor, Laboratory assistant
Grinding balls quality control		Grinding balls diameter Surface quality Grinding balls surface		Slide Calipers Visually Hardness tester	Each batch	Shift supervisor, Laboratory assistant
Grinding balls shipment		Shipped products conformity		Visually	Every wagon or truck	Laboratory assistant, Storekeeper. Head of laboratory Issued a document on quality